Alzheimer's Disease vs Parkinson's Disease: Cognitive vs Motor Predominance
Both are progressive neurodegenerative diseases in older adults, and late-stage symptoms overlap heavily — Parkinson's patients develop dementia, Alzheimer's patients lose motor function. Picking the wrong signature medication on the NCLEX (carbidopa-levodopa for Alzheimer's, or donepezil for Parkinson's motor symptoms) signals you can't distinguish the primary deficit.
Comparison
- ★↓ ACh in hippocampus/cortex → cognition deficit
- Gradual decline over 8–12 years
- ★↓ Dopamine in substantia nigra → motor deficit
- Progresses over 10–20 years
- ★4 A's: amnesia, aphasia, apraxia, agnosia
- Earliest: recent memory loss, wandering
- ★Resting pill-rolling tremor, unilateral
- TRAP; cogwheel rigidity, mask face, shuffling
- Clinical dx; rule out reversible causes
- Mental status exam (MMSE/MoCA)
- Clinical dx on cardinal motor signs
- Response to levodopa supports dx
- Wandering/elopement prevention, ID bracelet
- Structured, consistent environment
- Fall prevention — shuffling gait
- Assist with position changes
- Cholinesterase inhibitors (donepezil); memantine
- Donepezil: bradycardia; give at bedtime
- Carbidopa-levodopa; dopamine agonists
- Levodopa: dyskinesias, on-off, orthostasis
- Consistent routine; remove home hazards
- Simple one-step commands; don't quiz/correct
- Avoid high-protein meals with levodopa
- Encourage exercise; allow extra time
- Acute confusion change → rule out delirium
- Late dysphagia → aspiration risk
- Freezing + falls → injury risk
- Levodopa hallucinations, severe orthostasis
- Late: immobility, dysphagia, aspiration
- 50–80% develop Parkinson's dementia late
Alzheimer's Disease
- ★↓ ACh in hippocampus/cortex → cognition deficit
- Gradual decline over 8–12 years
Parkinson's Disease
- ★↓ Dopamine in substantia nigra → motor deficit
- Progresses over 10–20 years
Alzheimer's Disease
- ★4 A's: amnesia, aphasia, apraxia, agnosia
- Earliest: recent memory loss, wandering
Parkinson's Disease
- ★Resting pill-rolling tremor, unilateral
- TRAP; cogwheel rigidity, mask face, shuffling
Alzheimer's Disease
- Clinical dx; rule out reversible causes
- Mental status exam (MMSE/MoCA)
Parkinson's Disease
- Clinical dx on cardinal motor signs
- Response to levodopa supports dx
Alzheimer's Disease
- Wandering/elopement prevention, ID bracelet
- Structured, consistent environment
Parkinson's Disease
- Fall prevention — shuffling gait
- Assist with position changes
Alzheimer's Disease
- Cholinesterase inhibitors (donepezil); memantine
- Donepezil: bradycardia; give at bedtime
Parkinson's Disease
- Carbidopa-levodopa; dopamine agonists
- Levodopa: dyskinesias, on-off, orthostasis
Alzheimer's Disease
- Consistent routine; remove home hazards
- Simple one-step commands; don't quiz/correct
Parkinson's Disease
- Avoid high-protein meals with levodopa
- Encourage exercise; allow extra time
Alzheimer's Disease
- Acute confusion change → rule out delirium
- Late dysphagia → aspiration risk
Parkinson's Disease
- Freezing + falls → injury risk
- Levodopa hallucinations, severe orthostasis
Alzheimer's Disease
- Late: immobility, dysphagia, aspiration
Parkinson's Disease
- 50–80% develop Parkinson's dementia late
★ marks the fact that sets a column apart.
Clinical Pearl
Alzheimer's forgets first (↓ acetylcholine); Parkinson's trembles first (↓ dopamine) — onset sequence is your answer key.
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